Piston-ring-groove carbon scraper



C. AMUNDSON PISTON RING GROOVE CARBON SCRAPER July 24, 1923. 1,462,895

Filed Dec. 7. 1922 I N V5 701?. 6/9/17. firm/v0.50.

Patented July 24, 1923.

UNHTED era-res;

CARL AMUNDSON, OF SPRING GROVE, MINNESOTA.

PISTON-RING-GBOOVE CARBON sonArER.

Application filed December 7,1922. Serial No. 605,514.

T 0 all whom it'mag eoacems Be it knownthat-I, CARL AMUNns'oN, a citizen "of the United States, residing at Spring Grove,in the'co'unty of Houston and State of Minnesota, have invented certain new and useful Tn'i'provements in Piston- Bing-Gro'ove Carbon Scrapers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and-use the same' This, invention relates to a grooving tool and particularly to a tool adapted to remove the carbon from the piston ring grooves in the pistons of internal combustion engines. During the operation of such engines, a crust of carbon is deposited in the piston ring grooves which becomes hardened therein and is very difficult to remove. If it is attempted to remove this carbon with ordinary tools the edges of the grooves are'often roughened, scored, or otherv'vi'se damaged.

It is an object of this invention, therefore, to provide a tool by means ofwhich thesaid deposit of carbon can be "quickly and efficiently removed. 7

It is a further obje'ctof the invention to provide such a device equipped with a removable tool which may be adjusted as desired, which device is also equipped with a plurality of adjustable guiding means adapted to travel in the piston ring groove.

It is more specifically an object of the invention to provide such a device comprising a semicircular frame having a handle projecting substantially radially from one end and having the said removable tool adjacent its other end, said frame carrying a plurality of spaced adjustable guiding means adapted to travel in the piston ring groove.

These and other objects and advantages of the invention will be fully set forth in the following description made in connection with, the accompanying drawings in which like reference characters refer to the same parts throughout the different views, and in which,

Fig. 1 is a view in side elvation of a piston showing the device in use thereon;

Fig. 2 is a horizontal section through one of the grooves in said piston showing the device in operation thereon, a portion of the device being shown in section;

Fig. 3 is a horizontal section taken on the line 33 of Fig. 1. and Fig. 4 is a plan viewof one type of tool used.

Referring to the drawings, in ig.1, 'a

frame is made is bent upon itself" at the: other 7 end of the frame to form-a thickened por tion and said portion is provided Witlllfill aperture extending therethrough adapted to receive a tool 5 which is held in place in said aperture by a clamping setscr'ew 6 threaded into the end of the frame. The tool 5 is pro vided with a cutting edge 7, as "shown in Figs. 2 and 3, and conveniently may be provided with a cutting edge at each end. The frame 3 is bored and tapped at spaced points to receive thr'eadedor screw members 8 having laterally bent handle portions Q at their outer ends and provided 'tvith c iin drical portions 10- attheir inner ends inside of the frame 3. The members 8 are held, securely, in adjusted position in the frame 3 by lock nuts 11.

In operation, the tool is placed in position as illustrated in Figs. 1 and 2. The tool 5 substantially fits the piston ring groove. This tool and the members 8 are suitably adjusted so that the tool 5 will travel in the piston ring groove and the members 10 will also be disposed and travel therein. hen the tool and the members 8 have been suitably adjusted, the frame 3 is held against the piston and the device revolved by means of the handle 4. The tool 5 thus travelscircumferentially around the piston in the groove 2 and effectively removes the carbon deposit therefrom. If desired, the tool can be adjusted to cut a small shaving from the bottom of the groove and the groove thus deepened. The tool 5 is held in alinement with and proper relation to the groove by the guiding means 10 on the members 8, which guiding means will also travel about the piston in the groove 2.

The tool 5, as shown in Fig. 1 may .have different sized ends adapted to fit different sizes of grooves in the pistons.

From the above description it is seen that applicant has provided a very simple and officient carbon removing tool. The tool can be quickly and easily adjusted to suit clifferent diameters of pistons and the tool 5 can be changed to have'the size thereof accurately fit the size of the groove to be operated upon. The device is easily and ineX- pensively made and the various adjustments thereof can be made in a minimum of time. Furthermore, the tool is strong and durable. The piston to be operated upon is preferably handled with the connecting rod attached thereto, the piston being placed on top of the jaws ofa vise with the connecting rod extendingdownward between and gripped by the jaws. The piston is thus firmly held for the operation of the carbon removing device.

It will, of course, be understood that various changes may be made in the form, details, arrangement and proportions of the partswithout departing from the scope of applicants invention, which, generally stated, consists in the matter shown and described and set forth in the appended claims.

What is claimed is:

i 1. A grooving tool having in combination,

a semi-circular frame having a handle extending substantially radially from one end thereof, a tool removably held in said frame adjacent the end thereof opposite said handle, and adapted to substantially fit and travel in a piston ring groove, and spaced adjustable guiding means carried by said frame also adapted to move in said piston ring groove.

2. A device of the class described comprising a frame of substantially semi-circular shape having a handle atone end thereof, a radially adjustable tool removably held in one end of said frame, and spaced radially adjustable guiding means carried by said frame adapted to travel in the piston ring groove.

3. A device of the class described comprispiston ring grooves in the pistons of internal combustion engines having in combination, a frame formed of a fiat bar bent into substantially semi-circular shape and having ahandle portion projecting at one end, a radially adjustable and reversible tool removably held in the other end of said frame adapted to substantially 'fit in and travel in a piston ring groove, and spaced radially adjustable screws extending through said framehaving handle portions at their outer ends and cylindrical portions at their inner ends forming guiding means adapted to travel in said piston ring groove,

and means for holding said screws in adj usted position. 1

In testimony whereof I aflix my signature.

CARL AMUNDSON. 

